摘要
为了更加快速、便捷地分析围岩稳定性以及确定合理的锚杆支护参数,首先,采用均匀化方法,将锚杆与围岩的复合体考虑成材质连续、均质、各向同性的围岩加固体,继而,建立围岩与加固体协调变形力学模型,导出了加固体的物理力学参数表达式,最后,结合算例,将理论计算值与FLAC^(3D)数值模拟的结果进行对比分析,结果表明:理论计算得出的巷道硐壁位移和环向应力比FLAC^(3D)数值模拟的结果增加了4.72mm和1.55 MPa,而且理论计算与数值模拟得到的围岩应力以及位移曲线接近,从而验证了围岩加固体理论的合理性;锚杆支护对围岩加固体的内聚力和泊松比影响较大,但是随着锚杆长度增加影响程度在减小;与其他锚杆参数相比,锚杆预紧力对加固体的物理力学参数影响较大。
In order to more quickly and conveniently analyze the stability of surrounding rock and to determine reasonable bolt support parameters, firstly, a homogenization method was adopted, and the composite of the bolt and the surrounding rock was considered as the surrounding rock reinforcement body with continuous, homogeneous and isotropic material. Then, the coordinated deformation mechanical model of surrounding rock and the reinforcement body was established, and the expressions of the physical and mechanical parameters of the reinforcement body were derived. Finally, combined with the example, the the-oretical calculation value was compared with the results of FLAC^3D numerical simulation. The results indicated that, the dis-placement and hoop stress of the tunnel wall that calculated by the theory increased by 4.72 mm and 1.55 MPa compared with the results of FLAC^3D numerical simulation. Moreover, the difference between stress and displacement curve of surrounding rock obtained by theoretical calculation and numerical simulation was very small, which verified the rationality of the theory of the surrounding rock reinforcement body. The bolt support had a greater influence on the cohesion and Poisson＇s ratio of the surrounding rocks reinforcement body, but the influence degree decreased with the increase of bolt length. Compared with other bolt parameters, the bolt preload had a great influence on the physical and mechanical parameters of the surrounding rock rein-forcement body.
作者
谷拴成
周攀
黄荣宾
孙魏
GU Shuancheng;ZHOU Pan;HUANG Rongbin;SUN Wei(School of Architecture and Civil Engineering,Xi＇an University of Science and Technology,Xi＇an,Shaanxi 710054,China)
出处
《矿业研究与开发》
CAS
北大核心
2018年第8期33-38,共6页
Mining Research and Development
基金
国家自然科学基金资助项目(51508462
11402195)
陕西省教育厅基金项目(2013JK0961)
关键词
矿业工程
巷道支护
均匀化方法
力学分析
稳定性
Mining engineering
Roadway support
Homogenization method
Mechanical analysis
Stability
